To analyse preterm birth rates worldwide to assess the incidence of this public health problem, map the regional distribution of preterm births and gain insight into existing assessment strategies.
分析全球早产率从而评估这个公共健康问题的发生率，绘制早产区域分布图并了解现有的评估战略。
Objective: To analyse the difference of the stress distribution during mandible to be forced at the midline.
目的：分析不同年龄的下颌骨正中受力时，下颌骨三维有限元分布的差异。
Objective To analyse the clinical significance of the immunophenotype, aneuploidy and cell circle distribution in children with acute leukemia (al).
目的分析小儿急性白血病(AL)的免疫表型、异倍体、细胞周期分布状况的临床意义。
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